Let $y = e ^ { x } \cos x$ Then $y \prime\prime$ is

A) $- 2 e ^ { x } \sin x$
B) $- 2 e ^ { x } \cos x$
C) $2 e ^ { x } \sin x$
D) $2 e ^ { x } \sin x$.
E) $e ^ { x } ( \sin x - \cos x )$

Question

Let $y = e ^ { x } \cos x$ Then $y \prime\prime$ is

A) $- 2 e ^ { x } \sin x$
B) $- 2 e ^ { x } \cos x$
C) $2 e ^ { x } \sin x$
D) $2 e ^ { x } \sin x$.
E) $e ^ { x } ( \sin x - \cos x )$

Quizplus · Accepted Answer

The Answer of Let $y = e ^ { x } \cos x$ Then $y \prime\prime$ is

A) $- 2 e ^ { x } \sin x$
B) $- 2 e ^ { x } \cos x$
C) $2 e ^ { x } \sin x$
D) $2 e ^ { x } \sin x$.
E) $e ^ { x } ( \sin x - \cos x )$

Let y=excos⁡xy = e ^ { x } \cos xy=excosx Then y′′y \prime\primey′′